Cyclone, GK 2.69 37mm O-Ring Kit Back Catalog number: 811-9927-05 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9929-01 Inhalable Dust Sampler, GSP-3.5 Conical Style Price on request 801012-100 Aircon-2 DC Programmable Area Air Sampling Pump, (No Power Module or Battery) Price on request 801863M Manual, BDX II Price on request